19990625: problems with McIDAS/GEMPAK Gif images and ImageMagick

Robert,

I have IM4.0.4 installed, and just ran convert with -negate -monochrome
and produced a dithered image with the white background...so at one time
it worked. You have a typo in -monochrome below which I assume is not your 
problem. Have you tried the Imagemagick mail list? 

You can also save yourself the step of converting a gempak gif to a white
background if you use the gpcolor program to define the background as
white beforehand, eg:

% gpcolor
 COLORS   = 101=white
 DEVICE   = gf
 GEMPAK-GPCOLOR>r
Creating process: gf for queue 4851
 Parameters requested: COLORS,DEVICE.
 GEMPAK-GPCOLOR>e

Now, when you run a gempak program, the background
color (which is #101) will be white.

Steve Chiswell
Unidata User SUpport


On Fri, 25 Jun 1999, Robert Mullenax wrote:

> I had been using ImageMagick ver 3 on our Solaris Intel
> machine to convert GEMPAK/McIDAS images with black backgrounds
> to white backgrounds using the negate feature, or monochrome
> to make it B&W.  However, I obtained the latest relaese of ImageMagick
> (ver 4.27) for our Sparc and it will not perform
> the conversion properly, -negate -mnochrome produces a 
> completely black image on a GEMPAK(GARP) image with a 
> black background.  Doing the same on our Intel machine
> and IM 3.0 produces the desired B&W image.  I also
> tried IM 4.27 on another Solaris Intel machine with
> the same results.
> 
> Are there any other image viewer/converters out there
> that can also be run from the command line for
> use in scripts?  I will also look for an older version
> of ImageMagick.
> 
> Thanks
> Robert Mullenax
>